Introduction
The LH test is a blood test that measures the amount of luteinizing
hormone (LH) produced by the pituitary gland. In men, LH stimulates the
production of testosterone by the testes. In women, LH is one of the
hormones involved in the monthly release of an egg from the ovaries.
amenorrhea, or absence of menstruation
delayed puberty
infertility, which is the inability to become pregnant
irregular menstrual cycles
pelvic pain
precocious puberty
vaginal bleeding without ovulation
A man may have an LH test if he has hypogonadism, or underdeveloped testes.
What is involved in preparation for the test
Greater-than-normal levels of LH may be found in the following conditions in women:
early onset of puberty, known as precocious puberty
Klinefelter's syndrome, a genetic disorder
menopause
polycystic ovary disease
premature failure of the ovaries caused by a genetic defect or related to radiation treatment
Turner's syndrome, a genetic disorder
Greater-than-normal levels of LH may be found in men
with nonfunctioning testes, or absence of testes, called anorchia.
Lower-than-normal levels in women may indicate:
anorexia nervosa, an eating disorder
breast-feeding
bulimia, an eating disorder
exercise-induced amenorrhea, or absence of menstruation
infertility
ovarian cysts, or fluid-filled sacs on the ovaries
the use of oral contraceptives, or birth control pills
Lower-than-normal levels in men may be seen with:
hypothalamic hypogonadism, which is caused by a disorder of the hypothalamus
multiple endocrine neoplasia, or tumors of the endocrine gland
Who is a candidate for the test?
Conditions that may call for LH evaluation in women include:How is the test performed?
A blood sample is taken from a vein on the forearm or hand. First, the skin over the vein is cleaned with an antiseptic. Next, a strong rubber tube, or tourniquet, is wrapped around the upper arm. This enlarges the veins in the lower arm by restricting blood flow through them. A fine needle is gently inserted into a vein, and the tourniquet is removed. Blood flows from the vein through the needle and is collected in a syringe or vial. After the needle is withdrawn, the puncture site is covered with a bandage for a short time to prevent bleeding.
What is involved in preparation for the test
A woman's healthcare provider may request that the test be performed at a certain time in the woman's menstrual cycle
What do the test results mean?
Normal values for males are 7 to 24 U/L (units per liter) and for females 6 to 30 U/L.Greater-than-normal levels of LH may be found in the following conditions in women:
Lower-than-normal levels in women may indicate:
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